Ndisotopes - Nd concentration does not increase with burial...

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Nd Isotopes Circulation Proxy Emily Pugh Aldo Rincon Melissa Ayvaz Allison Ned
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Nd Isotope Proxy Nd (REE element) originates in upper mantle Nd signatures in water masses traced to source region Intermediate residence time
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Surface vs. Deep Ocean
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Analysis [ 143 Nd/ 144 Nd] in diluted biogenic apatite from fossil fish teeth, fish debris or Fe-Mn crusts Marine Sediment Samples Nd isotopes extracted through multi-step chemical separation Mass Spectrometer measures 143 Nd/ 144 Nd ratio
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Assumptions Samples preserve an early diagenetic signal representative of Nd in bottom waters No effect of fractionation and dissolution during transport of Nd No mixing of additional water sources Nd signatures accurately reflect close continental source
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Advantages Perfect residence time
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Unformatted text preview: Nd concentration does not increase with burial depth or age No significant fractionation during diagenesis Abundance of fossil fish teeth Independence of in vivo behavior Provinciality of Nd isotope signatures Disadvantages Concentrations of Nd complicated by competing influences Continental Weathering Aeolian influences Boundary Exchange Potential Problems Contamination of the teeth Cleaning of the samples Previous reworking of sediments Local mixing Ideal Environmental Conditions Deep-sea sediments with reliable age controls Low carbonate and low sedimentation rate sites Authigenic deposits without fractionation Sites without sedimentary or volcanic components...
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This document was uploaded on 07/08/2011.

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Ndisotopes - Nd concentration does not increase with burial...

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